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參數(shù)資料
| 型號： | NCP5322ADWR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | LEAD FREE, SOIC-28 |
| 文件頁數(shù)： | 14/31頁 |
| 文件大小： | 726K |
| 代理商： | NCP5322ADWR2G |
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NCP5322A
http://onsemi.com
14
IOUT,PEAK
(VCOMP
VOUT
Offset) (RS
GCSA)
Figure 11 shows the step response of the COMP pin at a
fixed level. Before T1 the converter is in normal steady state
operation. The inductor current provides a portion of the
PWM ramp through the Current Sense Amplifier. The PWM
cycle ends when the sum of the current ramp, the “partial”
internal ramp voltage signal and Offset exceed the level of
the COMP pin. At T1 the output current increases and the
output voltage sags. The next PWM cycle begins and the
cycle continues longer than previously while the current
signal increases enough to make up for the lower voltage at
the V
FB
pin and the cycle ends at T2. After T2 the output
voltage remains lower than at light load and the average
current signal level (CSn output) is raised so that the sum of
the current and voltage signal is the same as with the original
load. In a closed loop system the COMP pin would move
higher to restore the output voltage to the original level.
SWNODE
V
FB
(V
OUT
)
Internal Ramp
CSA Out w/
Exaggerated
Delays
COMPOffset
CSA Out + Ramp + CS
REF
T1
T2
Figure 11. Open Loop Operation
Figure 12. Enhanced V
2
Control Employing Lossless Inductive Current Sensing and Internal Ramp
+
CSA
SWNODE
Ln
R
CSn
RLn
CSn
COn
CS
REF
+
V
OUT
(V
CORE
)
“FastFeedback”
Connection
+
PWM
COMP
To F/F
Reset
Channel
StartUp
Offset
+
E.A.
DAC
Out
V
FB
COMP
Internal Ramp
+
n = 1 or 2
C
CSn
+
Inductive Current Sensing
For lossless sensing, current can be sensed across the
inductor as shown in Figure 12. In the diagram, L is the
output inductance and R
L
is the inherent inductor resistance.
To compensate the current sense signal, the values of R
CSn
and C
CSn
are chosen so that L/R
L
= R
CSn
C
CSn
. If this
criteria is met, the current sense signal will be the same shape
as the inductor current and the voltage signal at CSn will
represent the instantaneous value of inductor current. Also,
the circuit can be analyzed as if a sense resistor of value R
L
was used as a sense resistor (R
S
).
When choosing or designing inductors for use with
inductive sensing, tolerances and temperature effects should
be considered. Cores with a low permeability material or a
large gap will usually have minimal inductance change with
temperature and load. Copper magnet wire has a
temperature coefficient of 0.39% per
°
C. The increase in
winding resistance at higher temperatures should be
considered when setting the I
LIM
threshold. If a more
accurate current sense is required than inductive sensing can
provide, current can be sensed through a resistor as shown
in Figure 10.
Current Sharing Accuracy
Printed circuit board (PCB) traces that carry inductor
current can be used as part of the current sense resistance
depending on where the current sense signal is picked off.
For accurate current sharing, the current sense inputs should
sense the current at relatively the same point for each phase
and the connection to the CS
REF
pin should be made so that
no phase is favored. In some cases, especially with inductive
sensing, resistance of the PCB can be useful for increasing
the current sense resistance. The total current sense
resistance used for calculations must include any PCB trace
resistance between the CSn input and the CS
REF
input that
carries inductor current.
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相關(guān)代理商/技術(shù)參數(shù) |
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| NCP5331 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase PWM Controller with Integrated Gate Drivers |
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| NCP5331FTR2 | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| NCP5331FTR2G | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate Drivers for Athlon RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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